A person evenly pulls the sled by applying force F = 80 H to the rope; the rope is pulled at an angle of 60 to the horizon.

univerkov | December 7, 2020 | education

A person evenly pulls the sled by applying force F = 80 H to the rope; the rope is pulled at an angle of 60 to the horizon. Determine the work A performed by a person while moving the sled by s = 100m.

Let us find the projection of the force F onto the x axis, co-directed with the horizon:
Fx = Fcos60 ° = 80H * 0.5 = 40H.
Work is the product of force and movement. Means:
A = Fx * s = 40H * 100m = 4000J = 4KJ.
Answer: 4kJ.

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